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bambamtran0803
1 năm trước
Cho tam giác ABC vuông tại A (AB bé hơn AC). Gọi I là trung điểm của BC. Qua I vẽ IM vuông góc với AB tại M và IN vuông góc với AC tại N. a) Chứng minh tứ giác AMIN là hình chữ nhật. b) Gọi D là điểm đối xứng với I qua N. Chứng minh tứ giác ADCI là hình thoi. c) Cho AC = 20cm, BC = 25cm. Tính diện tích tam giác ABC. d) Đường thẳng BN cắt DC tại K. Chứng minh: DK/DC=1/3. ~~~~~~~~~Làm kỹ cho mình câu d nhé~~~~~~~~~
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